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Sand washing drilling and grinding fluid system for high-temperature sulfur-containing deep well

A technology for sand flushing drilling and deep wells, which is applied in earthwork drilling, wellbore/well components, drilling compositions, etc. It can solve the problems of poor temperature resistance and shear resistance, non-acid resistance Eliminate problems such as high content of permanent guar gum residue, achieve the effect of reducing corrosion, improving operation success rate, and reducing operation risk

Pending Publication Date: 2022-01-11
CHINA PETROCHEMICAL CORP +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, high-temperature sulfur-containing wells often use modified guar gum and organic polymers for drilling, washing and grinding operations. There are many problems in the commonly used system, such as high residue content of modified guar gum, which will cause secondary pollution to the formation, and the viscosity of the base fluid is high. Poor drag reduction effect leads to high pump injection pressure; ordinary organic polymers have poor heat resistance and shear resistance, unstable drag reduction performance, some products are not acid resistant and have poor compatibility with sulfur removal agents

Method used

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  • Sand washing drilling and grinding fluid system for high-temperature sulfur-containing deep well
  • Sand washing drilling and grinding fluid system for high-temperature sulfur-containing deep well
  • Sand washing drilling and grinding fluid system for high-temperature sulfur-containing deep well

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Embodiment 1

[0024] A sand washing and drilling fluid system for high-temperature sulfur-containing deep wells, wherein the sand washing and drilling fluid is prepared according to mass percentage, 99.345% of water is weighed, and 0.05% of heat-resistant polymer drag reducer, 0.2% of Fluorocarbon surfactant, 0.2% small cationic polymer clay stabilizer, 0.2% s-triazine sulfur remover, 0.005% potassium hydroxide pH regulator; the performance parameters of the system are as follows: when the line speed is 18m / s The drag reduction rate is 72%, the apparent viscosity is 9.0mPa·s, the surface tension is 24.7mN / m, the interfacial tension is 2.1mN / m, and the anti-swelling rate is 82.4%. When the hydrogen sulfide concentration is 1500ppm, the sulfur removal rate reaches 100%. pH 8.0.

Embodiment 2

[0026] A sand washing and drilling fluid system for high-temperature sulfur-containing deep wells, wherein the sand washing and drilling fluid is prepared according to mass percentage, 99.265% of water is weighed, and 0.03% of temperature-resistant polymer drag reducer, 0.3% of Fluorocarbon surfactant drainage aid, 0.2% quaternary ammonium cationic surfactant clay stabilizer, 0.2% s-triazine sulfur removal agent, 0.005% potassium hydroxide pH regulator; the performance parameters of the system are as follows: When the line speed is greater than 18m / s, the drag reduction rate is 71.5%, the apparent viscosity is 4.8mPa s, the surface tension is 23.1mN / m, the interfacial tension is 1.2mN / m, and the anti-swelling rate is 82.4%. The sulfur rate reaches 100%, and the pH value of the solution is 7.5.

Embodiment 3

[0028] A sand washing and drilling fluid system for high-temperature sulfur-containing deep wells, wherein the sand washing and drilling fluid is prepared according to mass percentage, 99.332% of water is weighed, and 0.01% of heat-resistant polymer drag reducer, 0.2% of Fluorocarbon surfactant, 0.3% small cationic polymer clay stabilizer, 0.15% modified triazine sulfur remover, 0.008% sodium hydroxide pH regulator; the performance parameters of the system are as follows: when the line speed is greater than 18m / s The drag reduction rate is 65.5%, the apparent viscosity is 1.3mPa·s, the surface tension is 23.8mN / m, the interfacial tension is 1.7mN / m, and the anti-swelling rate is 87.2%. When the hydrogen sulfide concentration is 1500ppm, the sulfur removal rate reaches 100%. The pH of the solution was 8.2.

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Abstract

The invention relates to a sand washing drilling and grinding fluid system for a high-temperature sulfur-containing deep well, which comprises the following components in percentage by mass: 0.01-0.3% of a temperature-resistant drag reducer, 0.1-0.3% of a discharge aiding agent, 0.1-0.3% of a clay stabilizer, 0.03-0.2% of a sulfur removal agent, 0.001-1.0% of a pH regulator and the balance of water. The system is suitable for underground sand washing, drilling and grinding and well washing operation of oil and gas reservoirs with the temperature of 180 DEG C or below, pump injection friction resistance can be effectively reduced, hydrogen sulfide returned along with operation liquid can be efficiently removed under the high-temperature condition, damage of hydrogen sulfide to ground personnel, equipment, underground tools and drilling tools is avoided, and therefore high-temperature sulfur-containing deep well sand washing, drilling and grinding operation is smoothly achieved.

Description

technical field [0001] The invention relates to the technical field of downhole operation of oil and gas reservoirs, and more precisely, relates to a sand flushing drilling fluid system for high-temperature sulfur-containing deep wells. Background technique [0002] During the development and production of oil and gas fields, the hydrogen sulfide produced with oil and gas can easily lead to personnel poisoning, hydrogen embrittlement of steel, and damage to downhole tools, which poses a very serious threat to safe construction. Since my country first discovered oil and gas reservoirs with high hydrogen sulfide content in the Sichuan Basin in 1958, Weiyuan Gas Field, Puguang Gas Field, and Yuanba Gas Field have been discovered successively, and several hydrogen sulfide-containing gas fields have also been discovered in the Tarim Basin. These gas fields have the characteristics of "one super, three high", that is, super deep (6500-7100m), high pressure (70MPa), high temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54C09K8/60C09K8/68
CPCC09K8/54C09K8/68C09K8/882C09K8/602C09K8/604C09K8/607C09K8/608C09K2208/32C09K2208/12
Inventor 张国锋王冰闫秀郝玉芬胡光钟涛
Owner CHINA PETROCHEMICAL CORP
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